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IPSP支持BLE设备之间进行IPv6数据包交换；
主体框架如下：
IPSS,GATT,ATT仅用于服务发现，GAP用于设备发现和连接建立；
IPSP定义了两个角色：Node role and Router Role；
Router role用于设备路由IPv6数据包；Node role仅能originate or consume IPv6应用数据包；
A Node Role shall support GAP peripheral role;
A Router Role shall support GAP Central role;
A device may support both Node role and Router role;
Node Role Requirements:
GATT Server Role , IPSS(Service)
The IP support service is used during service discovery to determine support for the IP Support
Profile’s Node role.
The service UUID shall be set to « Internet Protocol Support Service» [ 0x1820 ]
L2CAP Requirements:
In this profile, only the LE Connection Oriented Channels feature with the LE Credit Based Flow
Control Mode shall be used.
建立L2CAP 连接：（建立链路层连接之后）
LE Credit Based Connection Request Packet格式为：
IPSP中指定LE Credit Based Connection Request Packet的LE_PSM字段设置为LE_PSM_IPSP(0x0023)；
LE Credit Based Flow Control Mode参见L2CAP Spec 10小节
MTU size shall be 1280 octets or higher.
理解IPSP(Internet Protocol Support Profile)
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原文地址：http://www.cnblogs.com/bhm-vera/p/4969822.html
